tnc3-firmware/TNC/HdlcDecoder.cpp

54 wiersze
1.3 KiB
C++

// Copyright 2016 Rob Riggs <rob@mobilinkd.com>
// All rights reserved.
#include "HdlcDecoder.hpp"
#include "GPIO.hpp"
namespace mobilinkd { namespace tnc { namespace hdlc {
Decoder::Decoder(bool pass_all)
: state_(SEARCH), ones_(0), buffer_(0), frame_(acquire())
, bits_(0), passall_(pass_all), ready_(false)
{}
IoFrame* Decoder::operator()(bool bit, bool pll)
{
IoFrame* result = nullptr;
// It appears that the ioFramePool may not get initialized in the proper
// order during some builds.
if (nullptr == frame_) frame_ = acquire();
if (nullptr == frame_) return result;
if (not pll) {
if ((state_ == FRAMING) and (frame_->size() > 17) and passall_) {
frame_->parse_fcs();
if (passall_ or frame_->ok()) {
result = frame_;
ready_ = false;
frame_ = acquire();
return result;
}
}
reset();
} else {
if (process(bit)) {
ready_ = false;
frame_->parse_fcs();
if (passall_ or frame_->ok()) {
result = frame_;
frame_ = acquire();
return result;
}
frame_->clear();
}
}
return result;
}
}}} // mobilinkd::tnc::hdlc